C＃设置新图像后如何从文件夹中删除以前的图像 [英] C# how to delete previous image from folder after setting new image

问题描述

我有表格，我可以编辑我的帐户的设置名称，姓氏，登录，密码以及Image.I需要当我选择图像然后点击按钮保存，必须从文件夹中删除上一张图片。如何我这样做了吗？

这是我正在编辑设置的表格 [ ^ ]

这是用户的帐户 [ ^ ]



我尝试过：

 //这是保存按钮点击
 private void bunifuImageButton1_Click（object sender，EventArgs e）
 {
 using（var context = new Suren_BankEntities（））
 {
 
用户建立=上下文。 Users.Find（Session.UserId）; 
 if（metroTextBox1.Text！= String.Empty）
 {
 established.Name = metroTextBox1.Text; 
} 
 if（metroTextBox2.Text！= String.Empty）
 {
 established.Surname = metroTextBox2.Text; 
} 
 if（metroComboBox1.Text！= String.Empty）
 {
 established.Country = metroComboBox1.Text; 
} 
 if（metroTextBox7.Text！= String.Empty）
 {
 established.CardNumber = int.Parse（metroTextBox7.Text）; 
} 
 if（metroTextBox5.Text！= String.Empty）
 {
 established.Login = metroTextBox5.Text; 
} 
 if（metroTextBox6.Text！= String.Empty）
 {
 established.Password = metroTextBox6.Text; 
} 
 if（pictureBox1.Image！= null）
 {
 established.Photo = this.n; 
} 
 context.SaveChanges（）; 
 MessageBox.Show（设置已编辑！）; 
 if（us == null）
 {
 us = new UserSettings（）; 
 us.Dock = DockStyle.Fill; 
 Profile.Instance.FormContainer.Controls.Add（us）; 
} 
 us.BringToFront（）; 
} 
} 
 
 //这是上传按钮点击
 private void bunifuImageButton6_Click（object sender，EventArgs e）
 {
 
 this.op = new OpenFileDialog（）; 
 if（op.ShowDialog（）== DialogResult.OK）
 {
 if（Directory.Exists（img））
 {
 try 
 {
 long random_number = DateTimeOffset.Now.ToUnixTimeMilliseconds（）; 
 File.Copy（op.FileName，@img \+ random_number + op.SafeFileName）; 
 pictureBox1.Image = new Bitmap（op.FileName）; 
 this.n = random_number + op.SafeFileName; 
} 
 catch（Exception ex）
 {
 MessageBox.Show（ex.Message）; 
} 
} 
} 
} 
 
 //用户设置的构造函数
 public UserSettings（）
 {
 DateTime now = DateTime.Today; 
 InitializeComponent（）; 
 using（var ctx = new Suren_BankEntities（））
 {
 this.user = ctx.Users.Find（Session.UserId）; 
 label3.Text =Name：+ user.Name; 
 label4.Text =Surname：+ user.Surname; 
 label5.Text =生于+ user.Country; 
 label6.Text =年龄：+（now.Year  -  user.Date.Year）+岁岁; 
 label7.Text =卡号为：+ user.CardNumber; 
 label13.Text =AMD：+ user.AMD; 
 label12.Text =RUR：+ user.RUR; 
 label11.Text =USD：+ user.USD; 
 label8.Text =登录：+ user.Login; 
 label9.Text =密码：+ user.Password; 
 if（File.Exists（@img\+ user.Photo））
 {
 pictureBox2.Image = new Bitmap（@img \+ user.Photo）; 
} 
 else 
 {
 pictureBox2.Image = new Bitmap（@img\ devault.png）; 
} 
} 
} 

解决方案

文件。删除方法（字符串）（System.IO） [ ^ ]

I have form where i can edit my account's settings` Name,Surname,Login,Password and also the Image.I need when i choose the image then click on button save, the previous image must be deleted from folder.How can i do it?
This is the form where i'm editing settings[^]
This is User's account[^]

What I have tried:

 // This is Save button click
private void bunifuImageButton1_Click(object sender, EventArgs e)
        {
            using (var context = new Suren_BankEntities())
            {
                
                User founded = context.Users.Find(Session.UserId);
                if(metroTextBox1.Text != String.Empty)
                {
                    founded.Name = metroTextBox1.Text;
                }
                if (metroTextBox2.Text != String.Empty)
                {
                    founded.Surname = metroTextBox2.Text;
                }
                if (metroComboBox1.Text != String.Empty)
                {
                    founded.Country = metroComboBox1.Text;
                }
                if (metroTextBox7.Text != String.Empty)
                {
                    founded.CardNumber = int.Parse(metroTextBox7.Text);
                }
                if (metroTextBox5.Text != String.Empty)
                {
                    founded.Login = metroTextBox5.Text;
                }
                if (metroTextBox6.Text != String.Empty)
                {
                    founded.Password = metroTextBox6.Text;
                }
                if (pictureBox1.Image != null)
                {
                    founded.Photo = this.n;
                }
                context.SaveChanges();
                MessageBox.Show("Settings has edited!");
                if (us == null)
                {
                    us = new UserSettings();
                    us.Dock = DockStyle.Fill;
                    Profile.Instance.FormContainer.Controls.Add(us);
                }
                us.BringToFront();
            }
        }

//This is Upload button click
 private void bunifuImageButton6_Click(object sender, EventArgs e)
        {
            
            this.op = new OpenFileDialog();
            if (op.ShowDialog() == DialogResult.OK)
            {
                if (Directory.Exists("img"))
                {
                    try
                    {
                        long random_number = DateTimeOffset.Now.ToUnixTimeMilliseconds();
                        File.Copy(op.FileName, @"img\" + random_number + op.SafeFileName);
                        pictureBox1.Image = new Bitmap(op.FileName);
                        this.n = random_number + op.SafeFileName;
                    }
                    catch (Exception ex)
                    {
                        MessageBox.Show(ex.Message);
                    }
                }
            }
        }

//Constructor of User Settings
 public UserSettings()
        {
            DateTime now = DateTime.Today;
            InitializeComponent();
            using (var ctx = new Suren_BankEntities())
            {
                this.user = ctx.Users.Find(Session.UserId);
                label3.Text = "Name: " + user.Name;
                label4.Text = "Surname: " + user.Surname;
                label5.Text = "Born in " + user.Country;
                label6.Text = "Age: " + (now.Year - user.Date.Year) + " years old";
                label7.Text = "Card Number is: " + user.CardNumber;
                label13.Text = "AMD: " + user.AMD;
                label12.Text = "RUR: " + user.RUR;
                label11.Text = "USD: " + user.USD;
                label8.Text = "Login: " + user.Login;
                label9.Text = "Password: " + user.Password;
                if (File.Exists(@"img\" + user.Photo))
                {
                    pictureBox2.Image = new Bitmap(@"img\" + user.Photo);
                }
                else
                {
                    pictureBox2.Image = new Bitmap(@"img\default.png");
                }
            }
        }

解决方案

File.Delete Method (String) (System.IO)[^]

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